Little clean-up of ConstVectorOfPtrsAdaptor to be more vector like.

src/libslic3r/GCode/ToolOrdering.cpp

@@ -658,7 +658,7 @@ float WipingExtrusions::mark_wiping_extrusions(const Print& print, unsigned int
         return std::max(0.f, volume_to_wipe); // Soluble filament cannot be wiped in a random infill, neither the filament after it
 
     // we will sort objects so that dedicated for wiping are at the beginning:
-    ConstPrintObjectPtrs object_list = print.objects().vector();
+    ConstPrintObjectPtrs object_list(print.objects().begin(), print.objects().end());
     std::sort(object_list.begin(), object_list.end(), [](const PrintObject* a, const PrintObject* b) { return a->config().wipe_into_objects; });
 
     // We will now iterate through